Method and apparatus for automatic detection of a serial...

Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral monitoring

Reexamination Certificate

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C710S016000, C710S019000, C710S033000, C710S036000, C710S062000, C713S001000

Reexamination Certificate

active

07058732

ABSTRACT:
A method and apparatus for automatically detecting the memory size of a serial peripheral interface (SPI) device. Specifically, the present invention describes an SPI interface circuit including a memory controller chip, an EEPROM, a sensing circuit, and a pulldown resistor. In one embodiment, a “READ” command from the controller to the SPI device is sent in a first byte of information transferred between the controller and SPI device. The data Input/Output (D-IO) pin is then driven low for the second byte of information. Next, the D-IO pin is floated and the pin assumes a logic “0” level due to a pulldown resistor. Subsequently, a sensing circuit can detect when and if a non-zero data value passes from the SPI device to the memory controller chip to determine the memory size of the SPI device or the absence of an SPI device.

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